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At the time of the first wave of the COVID-19 pandemic, patients with cancer were considered to be at high risk of serious illness and had a higher exposure risk since they needed frequent and nondeferrable hospital visits. Serological tests were not routinely used, and seroprevalence in this population was unknown. A single-center, cross-sectional study was developed to determine the seroprevalence of anti-SARS-CoV-2 antibodies (Abs) in patients with cancer undergoing systemic antineoplastic treatment. One hundred patients were consecutively recruited in a two-week period (6th-20th May 2020), and serum samples were tested for the presence of immunoglobulin M (IgM) and immunoglobulin G (IgG) Abs directed against both spike (S) and nucleocapsid (N) SARS-CoV-2 proteins in two distinct time points (at recruitment and 4-8 weeks later). IgG-positive results were subject to confirmation, in the same serum sample, using two distinct assays. At the time of the first study visit, no patient

United statesPortuguese health authorityPortuguese national health authorityHospital da luz lisboa ethics committeeEastern cooperative oncology groupLuz lisboa ethics committeeMedical oncology unitIgg absCov iggIgg abbott architectAbbott diagnosticsOncology unitLuz lisboaPerformance statusAbbott architectDay hospital